By far, the bulk of the references I found to Pennyrich were from the late 1960's--and were advertising the Pennyrich bra(s). One of the articles had a little history of the company: "Penny Rich designed her first bra in 1950, when she was living in San Francisco., to solve her own problems of fit." The article noted: "Pennyrich business is split about 50-50 between women who are fitted in the shop and those who are fitted in their homes by trained Pennyrich consultants." There were a great many Pennyrich (International Inc) classified ads asking for "ambitious, experienced party plan leaders."
In December 1969 Pennyrich went into Chapter XI (they emphasized that was not bankruptcy). I found a few more ads, into at least 1974, for Pennyrich bras "and lingerie," but I had to stop searching shortly after that. If I have time I will try to find more information about when Pennyrich officially went out of business.